Perhaps this has been asked and answered before, I can't seem to find the answer to my curiosity - What does the "FB" stand for? I use Hahnemühle's Baryta FB350 for my b/w prints, it's a very nice paper.

In truth FB it only means that the paper does not have a plastic (resin) on its surface, so most fine art papers could be called FB, but as it is an acronym from the photographic world it is usualy assossiated to baryta type papers and not to the rag/watercolour papers.